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Brancaccia insists the alleged stalking only amounted to one email and two WhatsApp messages after Livia called off their relationship in June 2016.

She claims she began receiving threatening texts and calls from him.

Details of the police investigation first appeared in Italian newspaper La Repubblica.

They said Brancaccia had threatened to write compromising articles about the couple and had emailed photographs to Firth which prompted him to alert prosecutors.

A spokesman for the Firths said: “A few years ago, Colin and Livia privately made the decision to separate. During that time Livia briefly became involved with former friend Mr Brancaccia. The Firths have since reunited.

“Subsequently, Mr Brancaccia carried out a frightening campaign of harassment over several months, much of which is documented.”

Marco Brancaccia is accused of stalking Livia Giuggioli after she called off their affair (Image: Twitter)